Refrigerating system



Feb 11, 1930. F. B. HUNT REFRIGERATING SYSTEM Filed Jan. 21, 1927 IINVENTOR (m3. Ham BY M r,

ATTORNEYS Patented Feb. 11, 1930 UNITED STATES PATENT OFFICE FRANKLIN B.HUNT, OF OAK PARK, ILLINOIS, ASSIGNOR TO THE LIQUID GARBONIOCORPORATION, OF GHICAGO, ILLINOIS, A CORPORATION OF DELAWAREREFRIGERATING SYSTEM Application filed January 21, 1927. Serial No.162,601.

'mechanism takes up a minimum-space.

A further object is to provide a device of the type described in whichthe cooling of the cans is accomplished with the additionofcomparatively little cooling apparatus, and in which use is made of theso-called boilerswhich are ordinarily .used.

A further object of my invention is to pro-' vide a device of the typedescribed wherein the refrigerant liquid may be moved through a by-passwhich is positioned above. the com mon liquid level.

A further object of my invention is to provide a device of the typedescribed by means of which the high pressure in one refrigerant liquidcontainer is utilized for forcing the (liquid through an additionalcooling line to the other refrigerant liquid container.

Other objects and advantages will appear in the following specification,and the novel features of the invention will be particularly pointed outin the appended claims.

My invention is' illustrated in the accompanying drawings, forming partof this applic-ation, in which Figure 1 is a sectional view of a sodafountain with my, device applied thereto,

Figure 2 is an enlarged section substantially along the line2-2 ofFigure 1, and

Figure 3 is a modified form of my device. In carrying out my invention,I make use of a soda fountain 1 having aligned compartments 2 and 3 anda syrup enclosure 4 I which is positioned above the compartments 2 and3. V

A high pressure boiler 5 is disposed in the compartment 2 and rovidedwith a header 6 and a plurality of tu es or coils 7 having their ends incommunication with the header 6. A low pressure boiler 8 is disposed inthe compartment 3 and provided with a header 9 having tubes or coils 10communicating therewith.

A' compressor 11 is provided with a motor 12 and communicates with acondenser 13 through a tube 14. A liquid line 15 passes from the lowerportion of the condenser 13 to the lower portion of the header 6. Afloat valve 16 is pivotally mounted at 17 within nussuui the header 6.The float valve 16 is provided I with a plunger 18 which is adapted toclose the opening of the liquid line 15 for governing the flow of liquidwithin the header 6. A gas line 19 extends from the upper portion of theheader 6 to the upper portion of the-header 9 and is provided with anautomatic adjusting valve 20. The purpose of the. valve 20 is tomaintain a predetermined pressure in the header 6 and by so doing thecompressor is only allowed to draw gas from the header 6 until thispredetermined pressure is reached. A gas line 21 communicates with thegas line 19 at 22 and extends to the compressor 11. Acooling line 23extends from the lower portion of the header 6 into and through thesyrup enclosure 4. and into the compartment3 where it communicates withthe lower portion of the header 9. A float valve 24 which is identicalin construction to the float valve 16 is disposed in the header 9 and isadapted to govern the fiow of liquid into the header 9. A refrigerantliquid 25, such as sulphur dioxide, is disposed within the boilers 5 and8.

In Figure 2, I have shown an enlarged sectional view through the syrupenclosure 4. It is clearly shown in this view how the cooling line 23extends beneath syrup containers 26 which are disposed within the syrupen closure 4:.

From the foregoing description of the va rious parts of the device, theoperation thereof may be readily understood. Let us assume that thecompressor 11 is provided with the usual automatic switch for startingand stopping thecompressor at predetermined periods. Let us also assumethat the com pressor has been stopped for a time sufficient to allow thecompartments 2 and 3 and the syrup enclosure 4 to get relatively warm.The heat within the compartment 2 will be taken in through the tubes 7and into the uid boils at a very low temperature, the heat taken inthrough the coils 'or tubes 7 will cause the liquid to boil and form agas. When a predetermined amount of pressure has beendeveloped withinthe headers 6 and 9,

the compressor 11 will automatically start operating. Operation of thecompressor will force liquid into the header 6 for maintaining as nearlyas possible a predetermined level within the header 6. The compressorwill also draw the gases from the header 9 into the compressor where thegases are compressed and forced into the condenser 13 where they areagain changed into liquid form. The valve prevents the compressor fromdrawing gas from the header 6, after the gas within' the header 6 hasreached a predetermined point. Therefore, the pressure in the header 6is greater than the presaor sure in the header 9.

The difference between the pressure in the header 6 and the/pressure inthe header 9 is sufiicient to cause liquid to flow from the header 6through the cooling line and into the header 9. As the liquid flowsthrough the cooling line 23, heat within the syrup enclosure ispicked-up by the liquid. The heat which is received b the liquid causesthe liquid to boil, thus orming gas.- This operation is continued untilthe heat within the syru enclosure has been eliminated by the liquid,thus making the enclosure the desired temperature.

The compressor 11 continues in its operation until the heat within thecompartment 2 has been eliminated by the liquid within the boiler 5,until the heat within the syrup en-- closure 4 has been eliminated bythe liquid passing through the cooling line 23, and until the heatWithin the compartment 3 has been eliminated by the liquid within theboiler ,8. When this has been-accomplished, the .gas which, has beenformed by the rece ving of the heat has again been transformed into aliquid, thus reducing the pressure within the headers and permitting thecompressor to stop actuating.

In Figure 3, I have shown a modified form wherein the cooling line 23 isprovided with 0 an expansion valve 27 and is in communication withtheliquid line 15 instead of the header 6, as shown in Figure 1. Theboiler 5 and the valve 20 are not essential in causing the liquid tdflow through the cooling line 23. By setting the expansion valve tomaintain a higher pressure 'in the cooling line 23 than the pressure atwhich the boiler 8 is operating, liquid will flow through the 50 coolingline whenever the float valve 24 is.

open. 4 p I Although I have shownmy refrigeratmg system applied to asoda fountain, it is ob vious'that the system may be applied to numerousother devices, which contain articles 1,74e,seo

evaporators to said compressor comprising a common return conduit andbranch conduits connecting said evaporators with said common returnconduit.

2. In combination with aligned compartments of evaporators positionedwithin said compartments, means for supplying liquid refrigerant to saidevaporators in series comprising a compressor and condenser, a liquidsupply line connecting said condenser and the first of said evaporators,a second liquid supply line connecting said first evaporator and thesecond evaporator, communicating therewith below the liquid leveltherein, means for conducting vaporized refrigerant from saidevaporators to sa1d compressor comprlsmg a common return conduit andbranch conduits connecting said evaporators with said common returnconduit, and a. pressure responsive valve in the branch conduitconnecting said first evaporator whereby said evaporators may bemaintained at different temperatures.

3. In combination with aligned compartments and an'enclosure positionedabove said compartments, of evaporators positioned within saidcompartments, means for supplying liquid refrigerant to said evaporatorsin series comprising a compressor and condenser, a liquid supply lineconnecting said condenser and the first of said evaporators, a secondliquid supply line connecting said first evaporator and the secondevaporator, communicating therewith below the liquid level therein andpassing through said enclosure, means for conducting vaporizedrefrigera'nt from said evaporator to said compressor comprising a commonreturn conduit and branch conduitsconnecting said evaporators with saidcommon return conduit, and a pres sure responsive valve in the branchconduit connecting said first evaporator whereb said evaporators may bemaintained at d1 erent temperatures.

FRANKLIN B. UNT.

